A method of reducing residue from the combustion of paper or paperboard coated, a method of reducing wear of the grid used in the production of paper or cardboard, fibrous web material coated
(57) Abstract:The method concerns the reduction of the residue from the combustion of paper or paperboard coated. The method is carried out by replacing at least a partial number of conventional pigments and/or filler required to achieve the specified optical properties, the calcium oxalate. The method applies also to reduce wear of the grid used in the production of paper or cardboard by introduction of calcium oxalate in paper or cardboard tape, or in the dye layer is used as a cover tape instead of the usual pigments. Fibrous web material coated white ISO and opacity above 80% contains as filler and/or pigment calcium oxalate. The technical result is a decrease in the proportion of paper or cardboard with sufficient opacity and high strength, but also increase thermal stability and fire resistance. 3 S. and 14 C.p. f-crystals, 4 tab., 2 Il. The invention relates to a method of reducing residue from the combustion of paper or paperboard coated, to a method of reducing wear of the grid used in the production of paper or cardboard, fibrous roll material is coated.More Conesville paper, cardboard, polymer, paints, putties and similar products. In particular, the invention relates to the use of calcium oxalate as a filler and/or pigment in paper and paperboard coated with the target brightness and opacity.The invention also relates to a rolled tape of fibrous material coated in accordance with paragraphs 13 claims.Currently, the trend of the development of the paper product is increasingly buyers and legislative measures. Buyers of paper for printed products want to reduce postage costs and to reduce waste production. In the cost of managing waste paper also includes packaging, the value of which depends on the weight of the product. It is usually assumed that the various taxes on energy and emissions should be included in the price of paper products, which further increases their cost. For this reason, buyers of paper would like to have paper products with low specific weight, which nevertheless meet the standards of high quality. On the other hand, to information on paper could compete with the electronic media, is required alno high requirements for raw materials for paper and to methods of their production. Recently, in order to meet this requirement have been expended great effort to improve raw materials for paper and production methods. The aim is the production of paper, using smaller quantities of raw materials than before. When reducing paper weight opacity, it becomes an important characteristic. Opacity can be improved by increasing the filler content in the paper. This however reduces the strength of the paper and therefore make efforts to change the structure of the paper while maintaining the basic properties of the product. One additional property associated with the increase in the content of the filler and pigment in paper and cardboard, is the increase of residual ash, which makes it more difficult to use recycling fibers, for example, in energy production and their destruction by burning. Moreover, modern mineral fillers and pigments cause great wear of the wire, which shortens the service life of the latter.The aim of the present invention is to eliminate the disadvantages of the earlier technologies and the creation of an entirely new technical solution for coating on securities is rsii, especially polymer dispersion. The specific objective of the present invention is a pigment and a filler for paper and cardboard to reduce the weight without compromising the optical properties, especially the opacity of the paper. In addition, according to the present invention envisages the creation of new types of paper and cardboard products, with low ash content and high heat - resistant and fireproof.The invention is based on the idea of using calcium oxalate CaC2O4as filler and/or pigment. The calcium oxalate is almost insoluble in water, neutral or alkaline medium. Therefore, it is suitable for use as a filler for paper and cardboard in modern methods of paper production to the same extent as calcium carbonate. Moreover, it has good optical properties that allow its use as a pigment in many products. The residue from the combustion of calcium oxalate significantly less than the combustion of conventional pigments and in accordance with the present invention the calcium oxalate can therefore be used to replace, at least partially, conventional pigments and fillers required to achieve esenciales, it can be used, for example, toothpastes, and other pastes, in which the filler is expected, should cause minimal abrasion.More specifically, a method of reducing residue from the burning of paper and cardboard coated with the target brightness and opacity, in accordance with the present invention is characterized by what is stated in the characterizing portion p. 1 claims.Roll material according to the present invention is characterized by what is stated in the characterizing portion p. 13 claims.The present invention provides significant advantages. Thus, as mentioned above, the optical properties of calcium oxalate have a very good effect. Paper coated with this pigment has a high opacity and the weight can be reduced. On the other hand, the density of this pigment has a lower density than conventional pigments, which reduces the weight. According to the present invention sufficient opacity can be obtained by using a smaller amount of filler that gives the paper a higher strength. When using calcium oxalate as a pigment and/or filler to b is t to be studied more deeply with the following detailed description, have links to several working examples.In the attached drawings are given the image of crystals of calcium oxalate, obtained using an electron microscope (Fig.1) and a graph showing the distribution of grains of powdered calcium oxalate according to their size (Fig.2).Structure of calcium oxalate represented by the formula:
It usually exists in a hydrated form, having the General formula
in which n is usually 1 or 2 (monohydrate).In nature it can be in many plant cells, for example, in the stones formed in the urinary bladder and kidneys. As a pure substance, it is usually classified as a laboratory reactor and used for analytical purposes to determine calcium. Usually oxalates, as it was found, have a lubricating effect as coatings on metals (encyclopedia of chemical technology. Third edition, kirk Died, volume 16, page 630. Publisher John Wiley and sons, new York). For oxalic acid has a number of well-known applications, including processing, cleaning and coating of metals. Also known for its use for treatment of textiles and for colouring various INIA yellowing under the action of light paper, containing wood. However, it says nothing about the use of calcium oxalate as a filler or pigment to reduce the residue after incineration of paper and cardboard, especially coated paper having certain whiteness and opacity.The present invention uses new evidence that the ratio of the optical scattering of calcium oxalate in the form of coatings is very large (of the order of 250-500 m2/kg) depending on the structure of the coating. We found that the packing of the pigment is very optimal for the optical properties. In other words, although the refractive index is quite usual value, the pigment provides a large coefficient of light scattering and thus potentially greater opacity. The value of the coefficient of light scattering is very large compared even with titanium dioxide, which has a very large index of refraction and coefficient of light scattering is 160 m2/kg. with regard to optical properties, the packing of particles, and the coating structure is of great importance.When the tests also found that the wear caused by calcium oxalate, is very small compared with the wear and tear caused by normal pigmentation treatment is key.In the present claimed invention is also a method of reducing wear of the grid used in the production of paper or cardboard, which is characterized by the fact that the injected calcium oxalate in paper or cardboard tape, or in the dye layer is used as a cover tape instead of the usual pigments, so that the proportion of calcium oxalate in the total amount of pigments ranged from 10 to 100%.The calcium oxalate has a very low solubility in water. Only 0,0067 g/l monohydrate dissolved in water at a temperature of 13oC and even at a temperature of 95oC dissolved only 0,014 g/l, which corresponds to the amount of calcium carbonate in the form of calcite dissolved at room temperature. Solubility dihydrate even less. The solubility of gypsum is almost 500 times higher than the solubility of calcium oxalate. Replacing part of the conventional fillers and pigments are calcium oxalate, can significantly reduce the amount of soluble harmful substances in papermaking factory.Known fibrous web material with a coating containing a filler kaolin and pigment (SU 1250603, class D 21 H 27/20, 1986). Proposed fibrous web material is white and ISO opacity above 80% and contains as the LASS="ptx2">Monohydrate calcium oxalate thermally decomposes in three stages: first it evaporates (crystallization) of water, then allocated monoxide and post - dioxide and finally get the calcium oxide. In thermal decomposition weight of calcium oxalate is reduced by 80%. For this reason, the amount of ash in paper and cardboard can be significantly reduced by partial or complete replacement of kaolin, gypsum or calcium carbonate calcium oxalate. This feature is also seen in example 4, below. The residue from incineration of paper and paperboard, coated with and/or filler made of calcium oxalate may be at least 50%, preferably less, such as less than 35 or 30% depending on the content of calcium oxalate pigments and/or fillers in the product.You should indicate that as water and carbon monoxide and carbon dioxide can displace air and oxygen, in particular water and carbon dioxide being non-combustible gases, significantly increase thermal stability and the resistance of paper or cardboard. Therefore, the present invention can be made substantially fire-resistant rolled materials.Although paper or ka is oreda, he can still be damaged or destroyed by burning together with other flammable components, such as other paper or cardboard products or polymers, etc. of the Present invention therefore provides an advantageous way of eliminating paper and/or cardboard products by burning. This method involves Assembly of used paper and/or cardboard products having a content of calcium oxalate at least 10% of the amount of dry matter and preferably at least 50% of the total content of the pigment or filler in products; burning paper and/or cardboard product, the regeneration heat generated during combustion, and the collection and removal of ash.According to a preferred implementation variant of the invention the paper base, whether or not containing wood, may be intended for use in fire-resistant Wallpaper. As is well known to specialists in this field, the Wallpaper can be considered non-flammable if they contain, for example, 15% or less of the wood grain, while the rest are inorganic i.e., mineral fillers and pigments, which are not easily ignited. According to the invention, the ability of oxalate cal is to be used as an active moderator burning. Wallpapers, containing more than 85% of calcium carbonate (based on dry weight) at least, are almost non-flammable and they will probably also meet the European standard SBI, according to which the test sample must withstand 70 cm propane flame, with thermal effect of the order of 40 kW/m2.As filler calcium oxalate is applied in an amount of from about 0.1 to 90%, preferably from 1 to 80% relative to the dry substance, and as a pigment it can be applied in an amount of from about 1 to 100 g/m2for each side of the roll of tape. Preferably, the content of calcium oxalate in the total amount of pigments and fillers is from about 10 to 100%, in particular from 10 to 95%.The calcium oxalate can be obtained by deposition of oxalate solutions of salts of calcium. It can also be purchased from commercial firms.Besieged monohydrate calcium oxalate has a narrower distribution of particle sizes in a rather narrow interval, which can be further improved by grinding. The average particle size of precipitated product about 3 μm, while the average particle size of the milled calcium oxalate is about 1.2 m is setting the log file name is less than 0.5 μm. Such a cool profile distribution of particle size provides good optical properties. The distribution of particle sizes is discussed in more detail in example 1.For use as a filler is suitable as precipitated calcium oxalate and ground.The use of calcium oxalate as a filler and pigment are described below, particularly in connection with the manufacture of cellulosic products. It should be noted however, that the same benefits and features, in particular the optical properties associated with working examples, can be successfully used in many other industries. The calcium oxalate can be used as filler in the sector producing polymers and dyes, and in the production of pastes and polymer dispersions. It's also quite possible the use of calcium oxalate in cosmetics, pharmaceuticals (including toothpaste), washing powders, fertilizers, etc.The term "cellulosic material" refers to paper or cardboard, or the corresponding material containing cellulose and which is produced from lignocellulosic raw material, in particular of wood or of annual and Verbania coated and bond paper) and can be made of wood, paludrine (hematemesis) or chemical pulp. The mass may be bleached or unbleached. Usually the weight of the roll of material is in the range from 35 to 500 g/m2.The calcium oxalate is used as a filler to the pulp material in a known manner. Wood or chemical mass is formed fibrous mass by its thickening in the water. In predetermined quantities in the mass of added filler is from 0.1 to 90% and preferably from about 1 to 70% by weight of the total roll of tape, with the consistency of the fibrous mass is usually from 0.1 to 5%. The aqueous phase specified fibrous mass includes, for example, the clarified filtrate water circulating in the paper machine. the pH of the pulp fed to the distributor, neutral or slightly alkaline. Usually the pH is from about 6.5 to 8. pH paper machine may be somewhat higher than in the dosing device, usually from about 6.8 to 8.5. If necessary, for pH control of this fibrous mass and to control pH in paper production, use of an appropriate alkali or acid. Lye is particularly bicarbonate or carbonate of an alkali metal or a hydroxide of an alkali metal. As a result, Isleta and its acid salts, for example, alum, and the preferred alkali is sodium bisulfate. Paper tape is formed on a paper machine in a known manner.In the calcium oxalate can be entered in the appropriate additives for coatings of suitable colors. In the present invention, the term "colored coating" means a composition intended for the coating or surface layer of the paper or paperboard and containing water and known components, for example, pigments, binding agents and components regulating the viscosity (thickening agent). In addition to calcium oxalate can be used the following contacts: calcium carbonate, calcium sulfate, aluminum silicate, talc (magnesium silicate containing water of crystallization), titanium oxide, titanium dioxide, silicon dioxide, barium sulfate and mixtures thereof. Can also be used synthetic pigments. The main pigments of the above are calcium oxalate, kaolin and/or calcium carbonate, is usually contained in an amount exceeding 50% of the dry matter of the composition for coating. Whether kaolin, titanium oxide, precipitated calcium carbonate, a white pigment, aluminium hydroxide, silica-sodium aluminate and plastic pigments are the different pigments, I should mention, are special kaolin and calcium carbonates, barium sulphate and zinc oxide.As a binder may be used any known binder, which is often used in paper production. In addition to a separate binder is also possible to use mixtures of binding agents. As specific examples of binding agents include the following: synthetic latex binder consisting of polymers or copolymers with ethylene unsaturated bonds, a type copolymers of butadiene-styrene, which may contain comonomer with carboxylate groups, for example, acrylic acid, taconova acid or maleic acid, and polyvinyl acetate, which contains comonomers with carboxylate groups. As a binder can be used in combination with the above substances, for example, water-soluble polymers, starch, carboxymethylcellulose, gidroxiatilzelluloza and polyvinyl alcohol.In the mixture to form a coating can also be used conventional additives and substances that increase the impact of, for example, dispersing agents (for example, sodium salt of polyacrylic acid), a substance lynati, salts of benzoic acid), lubricating agents, reagents for increasing water hardness and improve its resistance, optical agents, antifoaming additives and substances for pH control to prevent degradation of the product. Among the lubricating agent comprises from sulphonated oils, esters, amines, stearates of calcium and ammonium; an agent that increases the water resistance is glyoxal; optical agents are diaminostilbene and derivatives disulfonic acid; antifoaming agents are phosphate esters, silicones, alcohols, ethers, vegetable oils; pH regulators are sodium hydroxide, and ammonium; and finally, antidegradants are formaldehyde, phenol, and salts of Quaternary ammonium bases.Composition for coating in accordance with the present invention can be used as a priming mixture for applying colored surface coating. On 100 wt. parts of pigment colored coating typically contains from about 0.1 to 10 wt. parts of thickener and from 1 to 20 wt. parts of the binder.Composition of a typical priming mixture as follows, wt.h.:
The pigment and the filler (calcium oxalate, if necessary, together with some aspects of
The composition for surface color coating according to the present invention has, for example, the following composition, wt.h.:
the pigment/filler 1 (calcium oxalate) - 30-90
not mandatory second pigment/filler kaolin and/or carbonate) - 10-30
just pigment - 100
thickener - 0,1-2,0
binder - 1-20
the additive is 0.1 to 10
water - the rest
The weight of coating applied on both sides of the paper tape, usually from about 5 to 100 g/m2.The opacity of the paper with a coating of pigments based on calcium oxalate is usually above 90% and can achieve the level of whiteness in accordance with the standard of the International organization for standardization (ISO) about 90%.The following non-limiting examples illustrate the present invention. The coefficient of light scattering, light absorption coefficient and opacity were determined in accordance with standard SCAN 8:93. White ISO at a wavelength of 457 nm was determined according to standard SCAN-P 3:93. The weight of the plates and their thickness was determined according to the standards SCAN-P 6:75 and SCAN-P 7:75, respectively.Example 1
The production of calcium oxalate pigment quality and size of its particles
Parasomnia sludge. The slurry was razmalyvanija in a ball mill with glass grain size of 1 mm without additives. Milled material was filtered through a ceramic filter and the distribution of particle size was determined by the method Coulter LS (Fig. 2). Quantitatively the distribution of particle sizes is presented in table.1.Thus the distribution of the particles of calcium oxalate in size is located in a rather narrow range that has a beneficial effect on the optical properties.The dry matter content in the product was 54 wt.%, and the average particle size of 1.4 microns.Example 2
Determination of specific surface and snoopable of calcium oxalate.Using milled slurry as in example 1 was determined the wear caused by the grid, and specific surface area (BET) of calcium oxalate. The specific surface of the sample was 4.4 m2/g, and specific surface area of calcium oxalate was the same order as that of the carbonate - calcium cyanate.Snoopable of calcium oxalate amounted to 2.79 g/m2. In table.2 shows a comparison of calcium oxalate with conventional pigments in relation to their snoopable.As clearly seen from the table, the calcium oxalate in the optical properties of coatings and coated paper.On the sludge, considered in example 1 was also conducted studies to determine the coefficients of scattering and absorption coefficients of light (at a wavelength of 457 nm) of calcium oxalate. Measurements were taken on glass plates, and paper-based. Is determined by the optical properties were S - and K values and the opacity value. These values were determined for two different wavelengths, for example, 557 and 457 nm.To determine film properties of calcium oxalate, first, on a glass plate was covered with the pigment slurry in the form of two layers of different thickness, using a squeegee to paste.For films on glass slides were first identified R0and R00apart from the floor. A piece of cardboard with a coating of slurry of calcium oxalate was used as the background for the definition of R00. To determine the thickness of this coating was measured thickness of the glass plates for both covered and non-covered part. Surface area was determined by weighing the plates, followed by flushing of the film cuttings and re-weighing plate.The results of the changes in surface area, thickness and optical properties of the films on glass Pld with a specific gravity of 47.0 g/m2.The same measurements as above were conducted for the paper base and for the combination of the paper base and the pigment film. Due to the fact that the S - and K values can be considered additive, the results presented were calculated so that the influence of the paper base can be excluded from the results obtained for the combination of paper-based plus pigment film. These results are presented in table.4.As a conclusion from the above results, it should be noted that the light scattering coefficient of calcium oxalate is very large and when measured it on the coating layer, it is from 250 to 500 m2/kg depending on the grain size and distribution. A large value of this ratio indicates that the packaging of pigments is very optimal for the optical properties. In other words, despite the fact that the refractive index has a normal size (from about 1.5 to 1.6) pigment provides a very large coefficient of light scattering and thus the possibility of a large opacity. As regards the optical effect of the packing particles, and the structure of the coating, they are very important characteristics.Example 4
The residue from the burning of securities 1.63 g (dry).Plate 1: (calibration): 40% wt. kaolin, 60% wt. fibers
Disc 2: (calibration): 40% wt. calcium carbonate, 60% wt. fibers
Plate 3: 40% wt. calcium oxalate, 60% wt. fibers
Plates were burnt and residues from the combustion weighed. Residues from combustion were the following:
Plate 1: 0.65 g
Plate 2: 0, 46 g
Plate 3: 0.25 grams
Thus the plate containing calcium oxalate, had significantly less residue after combustion than records containing other pigments. This feature is very important to reduce paper waste, which also reduces the cost of their removal to the dump. 1. A method of reducing residue from the combustion of paper or paperboard coated with the target brightness and opacity, characterized in that replaces at least a partial quantity of filler and/or pigment coating required to achieve the desired whiteness and opacity, the calcium oxalate.2. The method according to p. 1, where the proportion of calcium oxalate is 10 to 100% of the total pigments.3. The method according to p. 1 or 2, where the coated paper is made with white ISO above 80% and the opacity to 80%.
">5. The method according to any of the preceding paragraphs, which produces paper that does not contain wood.6. The method according to any of paragraphs.1 - 4, which produces paper, containing wood.7. The method according to any of the preceding paragraphs, where the number of calcium oxalate is 0.1 - 90% (based on dry substance of the paper or paperboard.8. The method according to any of the preceding paragraphs, where the use of calcium oxalate with a narrow distribution of particle sizes.9. The method according to p. 8, where the calcium oxalate razmarivaet to particles of suitable size.10. The method according to any of the preceding paragraphs, where the use monohydrate calcium oxalate.11. The method according to any of the preceding paragraphs, where the use of the second pigment or filler selected from the group consisting of calcium carbonate, calcium sulfate, aluminum silicate, kaolin and aluminum hydroxide, magnesium silicate, talc, titanium dioxide, silicon dioxide and sulfate, boron, and mixtures thereof.12. A method of reducing wear of the grid used in the production of paper or cardboard, characterized in that the injected calcium oxalate in paper or cardboard tape, or in the dye layer is used as the coating is CLASS="ptx2">13. Fibrous web material with a coating, characterized in that it has white and ISO opacity above 80% and contains as filler and/or pigment calcium oxalate choice together with fillers and pigments for coatings, respectively.14. The rolled material on p. 13, characterized in that the maximum residue from the combustion of 35% (based on dry substance of the material.15. Roll material under item 13 or 14, characterized in that it is produced from cellulose or wood pulp.16. Roll material according to any one of paragraphs.13 to 15, characterized in that the total content of calcium oxalate is above 85% of the dry matter of the paper.17. Roll material according to any one of paragraphs.13 to 16, characterized in that it, itself, is essentially non-flammable.
FIELD: chemical and pulp-and-paper industry.
SUBSTANCE: aqueous suspension of at least one filler or mineral contains natural carbonate, polymeric dispersing agent as stabilizer of suspension viscosity, product of natural carbonate treatment with gaseous CO2, and product of natural carbonate reaction with at least one medium or strong H3O+-donors, has pH more than 7.5 at 200C. As natural carbonate suspension contains calcium carbonate (e.g., marble, calcite, carbonate-containing dolomite, chalk, ore mixtures thereof with talcum, and/or TiO2, MgO, or other minerals inert to H3O+-donors). As H3O+-donors suspension contains H2SO3, HSO
EFFECT: paper with decreased mass at constant surface.
33 cl, 1 dwg, 2 tbl, 8 ex
FIELD: manufacture of smoke articles.
SUBSTANCE: wrapping paper contains calcium carbonate and combustion regulating substances, said components being used in predetermined ratio. Combustion regulating substance is sodium citrate or potassium citrate. Ash content in surface layer on at least one side of wrapping paper or on each of two sides, i.e., on upper and lower sides of wrapping paper, does not exceed 35 wt%.
EFFECT: reduced quantity of smoke in visible indirect tobacco smoke stream.
6 cl, 10 dwg, 4 tbl, 4 3x
FIELD: paper industry.
SUBSTANCE: base paper for decorative coating materials contains 10 to about 65% of pigment, which includes silicon- and aluminum-modified titanium dioxide in combination with another, white pigment. Titanium dioxide-based pigment is characterized by oil capacity at least 25% and solubility in sulfuric acid at least 15% TiO2. Invention also provides decorative paper or decorative film containing above base paper.
EFFECT: increased opacity of base paper at lower consumption of titanium dioxide.
7 cl, 1 tbl, 8 ex
FIELD: paper-and-pulp industry.
SUBSTANCE: invention relates to pigment, which can be used in manufacture of paper with filler, coated paper, and cardboard. Calcium hydroxide and calcium carbonate powders taken in proportion between 1.0:2.2 and 1.0:23.5 are added to vigorously stirred water, after which temperature of mixture is raised to 80-85°C and resulting reaction mixture is kept being stirred for 90-180 min to form dispersion of pigment containing 20-35% solids.
EFFECT: improved quality of pigment at lower cost and extended application area.
FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.
SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. In the water at intense stirring feed powders of calcium hydrate and calcium carbonate at the ratio of the indicated components accordingly from 1.0:2.2 up to 1.0:12.9. The produced suspension is gradually added with aluminum sulfate at its ratio to the total mass of the calcium hydroxide and calcium carbonate from 1.0:0.85 up to 1.0:4.30. Then the temperature of the mixture is increased up to 8О-85°С and the produced reaction mixture is kept at stirring within 90-180 minutes with formation of the dispersion of the pigment with the share of the dry substances in it equal to 20-35 %. Then the dispersion is dried and grinded into the powder. The powder is dispersed in the water containing the given amount of the dissolved coolant and-or binding - starch or polyvinyl alcohol. The technical result of the invention production of the pigment with the new properties, that allow to expand the field of its application at manufacture of various types of the cardboard and the paper.
EFFECT: the invention ensures production of the pigment with the new properties, expansion of the field of its application at manufacture of various types of the cardboard and the paper.
FIELD: pulp and paper industry; methods of production of the composite pigment for manufacture of the cardboard and paper.
SUBSTANCE: the invention is pertaining to the method of production of the composite pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium hydroxide is mixed with kaolin and added with aluminum sulfate in the aqueous medium at stirring. The aqueous medium contains the binding chosen from the group, which includes starch and polyvinyl alcohol in amount of 1.5-5.0 % from the mass of the absolutely dry pigment, and-or the water soluble colorant in amount of 0.1-0.5 % from the mass of the absolutely dry pigment. The technical result of the invention is the improvement of the composite pigment quality and expansion of its field of application.
EFFECT: the invention ensures improvement of the composite pigment quality and expansion of the field of its application.
FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.
SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium hydroxide suspension is treated with aluminum sulfate solution in the aqueous medium at stirring. The treatment is conducted in the aqueous medium containing the binding in the dissolved state. The binding is chosen from the group, which includes starch and polyvinyl alcohol in the amount of 0.5-5.0 mass % from the mass of the absolutely dry pigment, and-or the colorant in the amount of 0.1-0.5 mass % from the mass of the absolutely dry pigment. The technical result of the invention is the improved quality of the pigment and expansion of its field of application.
EFFECT: the invention ensures the improved quality of the pigment and expansion of the field of its application.
FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.
SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium carbonate is treated with aluminum sulfate in the aqueous medium. The treatment is conducted at aluminum sulfate consumption of 25-105 % to the mass of absolutely dry calcium carbonate at the temperature of 80-85°С during 90-180 minutes with production of the suspension containing 25-35 % dry substances in it. At that they use the aqueous medium containing the binding chosen from the group, which includes starch and polyvinyl alcohol in the amount of 0.5-3.0 mass % from the mass of the absolutely dry pigment, and-or the water soluble colorant in the amount of 0.1-0.5 mass % from the mass of the absolutely dry pigment. The suspension is additionally dried and grinded. The technical result of the invention is the improved quality of the pigment as well as expansion of its field of application.
EFFECT: the invention ensures the improved quality of the pigment as well as expansion of its field of application.
SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. Calcium carbonate is treated with aluminum sulfate in the aqueous medium. The treatment is conducted at aluminum sulfate consumption of 25-105 % to the mass of absolutely dry calcium carbonate at the temperature of 80-85°С during 90-180 minutes with production of the suspension containing 25-35 % dry substances in it. The suspension may be additionally dried and to produce the powder. The technical result of the invention is improvement of the pigment quality and expansion of the field of its application.
EFFECT: the invention ensures improvement of the pigment quality and expansion of the field of its application.
2 cl, 2 tbl
SUBSTANCE: invention can be used for production of deposited calcium carbonate used as paper filler. Secondary particle diameter of deposited calcium carbonate is 1-10 mcm. Deposited calcium carbonate consists of aggregated primary particles of spindle calcium carbonate with greater particle diameter within 0.5 to 3.0 mcm, smaller diameter within 0.1 to 1.0 mcm with ration of specified diameters equal to 3 or more. Specific surface area BET of primary particles of calcium carbonate is 8-20 m2/g, cell volume is 1.5-3.5 cm3/g. Method of production of deposited calcium carbonate includes as follows. Carbon dioxide or carbon dioxide gas is injected in calcium hydroxide suspension concentrated 100-400 g/l, prepared by wet calcined liming activity of which 4 "н." HCl at third minute value is reduced to 150-400 ml. Reaction is resulted in carbonisation degree within 50 to 85%. Then 1 to 20 vol % of calcium hydroxide suspension is added. Reaction is complete with injection of carbon dioxide or carbon dioxide gas. The paper containing the specified calcium carbonate as filler is offered as well.
EFFECT: enhanced paper bulkiness.
7 cl, 2 tbl, 10 ex
FIELD: paper coated with composition for coating various kinds of paper, for offset printing of paper used for manufacture of books, magazines, annual reports, or packaging paper.
SUBSTANCE: composition comprises pigments and binder. Composition pigments are formed as microballs having sizes below 10 micrometers, preferably about 7 micrometers. Paper coated with such composition is silky by touch and has at least one surface coated with such composition, preferably both of its surfaces. This paper may be tracing paper.
EFFECT: improved quality of paper owing to preventing sliding thereof during separation of sheets in stacks, delamination of coating during printing process and, accordingly, elimination of paper dusting and formation of impure imprints.
7 cl, 2 dwg, 2 tbl, 13 ex
FIELD: pulp-and-paper industry, in particular, paper sheet having surface feeling hash to the finger, and method for applying coating onto paper sheet.
SUBSTANCE: paper sheet of such structure may be used for manufacture of paper or plastic medium for carrying of printed information, paper or plastic package, cover used in stitching and binding processes, or cardboard or plastic carton having surface feeling hash to the finger. At least one side of paper sheet is coated with layer containing non-compressible microscopic particles of non-gelatinized starch grains, or said particles are produced by grinding of plastic material. Method involves treating at least one side of paper sheet with water-based composition containing non-compressible microscopic particles which are made three-dimensional and rounded, binder, and filler; drying paper sheet after treatment. Particles are non-gelatinized starch grains, or particles are produced by grinding of plastic material. Method allows paper sheet to be produced, which has roughness coefficient Kd below 0.5.
EFFECT: simplified method and improved quality of paper sheet.
17 cl, 16 dwg, 1 tbl, 3 ex
FIELD: textile, cotton.
SUBSTANCE: carton is intended for the packaging and can be used, for example, in the cellulose and cotton industry. On at least one of the carton's surface there are micro-lamellate cellulose particles. These particles have average volume size of the particles from approximately 20 micron to approximately 150 micron, average numerical size is from approximately 5 micron to approximately 20 micron and 95-percent average volume size not exceeding approximately 300 micron. This carton is used to produce package material. The mentioned carton can contain covering layer including the pigment. The covering layer is made of the composition containing the mentioned above micro-lamellate cellulose particles.
EFFECT: increases smoothness, toughness at the bend sides and improves the strength of the carton; it also increases its non-transparency and chalking of its covering.
24 cl, 8 dwg, 10 tbl
SUBSTANCE: invention can be used in processing of paper or plastics, concrete, in production of paints or in agriculture. Method of obtaining self-binding pigment particles includes supply of water suspension of mineral pigment material and at least one polymer binding agent. Said binding agent contains at least one modified polysaccharide, representing carboxymethylcellulose, and has carboxylation degree 0.4-2.0 and intrinsic viscosity from >300 to 500 ml/g. Binding agent is added to water suspension of mineral pigment in amount 0.1-10 wt %, counted per the total suspension weight, and mixed. Content of solid substances in obtained suspension constitutes from ≥45 to 95 wt %. Obtained suspension of mineral material is grilled.
EFFECT: invention makes it possible to obtain pigment suspensions with high content of solid substances with reduction of quantity of applied combustible binders and elimination of concentration stage.
23 cl, 2 tbl, 10 ex